Final answer:
Stereotyping that warrants criticism in contemporary realistic fiction is when characters, especially those of certain genders or races, are portrayed with generalized and superficial traits that diminish their complexity.
Step-by-step explanation:
Stereotyping in contemporary realistic fiction can be identified when certain groups or individuals are depicted with oversimplified and generalized traits, which can foster harmful perceptions and validate unfair biases. In the context of gender criticism and critical race theory, stereotypical representation becomes a source of critique, especially when it falls back on outdated or prejudicial views such as the overrepresentation of male characters, or using tropes that minimize the complexity of female characters and minorities.
Stereotyping of gender and race, as manifested through characters who lack depth or are reduced to their race or gender without nuance, is a form of criticism that is necessary to address in literature to advance more inclusive and representative narratives.